DELIVERED JUNE 2014
TRANSMISSOMETER DATA README FILE - JUNE 2014
This data package contains level-1 hourly transmissometer-based visibility data from the
remaining transmissometer site (listed below) in the IMPROVE visibility monitoring network.
This transmissometer site is operated by USDA-FS. The data included are from 1/1/13 through
12/31/13. There are a total of 4 transmissometer level-1 data files included. As with all level-1
transmissometer data, careful attention should be paid to the validity interference codes, which
indicate a variety of uncertainties in the processed measurements.
DATA FILE FORMAT KEY
The data file format key for all transmissometer data files is included in this folder and is
available in:



MS Word format
Adobe Acrobat format
Text only
(transkeyNov2003.doc)
(transkeyNov2003.pdf)
(transkeyNov2003.txt)
FILE NAMING CONVENTIONS
Quarterly data files are named XXXXX_T1W.YYS, where XXXXX is the site abbreviation, YY
is the year, and S is the calendar season:
1.
2.
3.
4.
=
=
=
=
Winter
Spring
Summer
Fall
(January, February, and March)
(April, May, and June)
(July, August, and September)
(October, November, and December)
For example, BRID1_T1W.131 contains Bridger Wilderness transmissometer data for the period
January 1, 2013 through March 31, 2013. The average size of a quarterly transmissometer file is
202 Kb.
SITE SPECIFIC NOTES FOR TRANSMISSOMETER DATA (1/1/2013 – 12/31/2013)
BRID1 – All readings from LPV-007 (installed 11/13/13 @ 1300 hrs) invalid. Bext too low and
not matching actual conditions 11/13/13 – 12/31/13.
TRANSMISSOMETER SITE IN THE IMPROVE VISIBILITY MONITORING
NETWORK (operated by USDA-FS):
BRID1 – Bridger Wilderness, WY